Automatic picot cutter for hemstitching machines



M. SIEGEL AUTOMATIC PICOT CUTTER FOR HEMSTITCH'ING MACHINES May 11,1926. 1584,@61

Filed June 10, 1925.

v mW/f 'l 28 ATTORN EY Patented May' 1l,

thtllilltli.

MYER SEGEL, OF BROEK, NEVT YORK.

AUTOMATXC 'PICOT CUTTER FOR 'EiSTTGI-ING MACHNES.

Appiicaaon med aan@ 1o, 1925. 'sensi no. 35,258.

rlhis invention relates to improvements in automatic picot cutters for hemstitching machines.

r1`he principal object of the invention resides in a cutter positioned rearwardly of the piercer bar of a hemstitching machine for automatically severing the threads of the fabric worked upon for producing a picot edge, the'cutter being operated by the movement of the piercer plunger bar.

Another object of the invention is to provide a lateral adjusting means for the cutting blades so as to position them at all times in alignment with the piercer bar for assuring an even picot edge on both edges of the fabric formed by severing the same.

A further yobject is the provision of a .pair of cutting blades pivotally mounted upon the pressed foot of a hemstitching machine, and tension means for holding said blades in cutting relation and for automatically compensating for any wear between said blades.

A still further object is to provide a cutter composed of a pair of pivoted blades for attachment to the presser foot of a hemstitching machine for automatically cutting the goods passed through the machine for forming a picot edge, and means for rendering the cutting blades inoperative when desired to use the machine for'hemstitching only.

With these and other objects in view, the inventionfresides in certain novel construction and combination and arrangement of parts, the essential features of which are hereinafter fully described, are particularly pointed out in the `appended claims, and are illustrated inthe accompanying drawing, in whichz- Figure 1 is a side elevation of my invenktion as applied to the presser foot of a hemstitching machine, the cutting blades being shown in an operative position.

Figure 2 is an end elevation.

Figure 3 is a horizontal sectional View on the line 3Q-3 of Figure 1.

Figure 4c is a horizontal the line l 4 of Figure 1. y f

Figure 5 is a detail view of the cutting blades in an inoperative position.

Referring more particularly to the drawing, the reference numeral 10 designates the presser foot bar of a hemstitching machine and which supports the presser foot 11 which. in turn provided with spaced shoes sectional view on lj'ositioned forward of the presser foot bar is a plunger rod 13 which is adapted to be reciprocated by the usual mechanism, and which rod supports a piercer bar bracket 14 which carries the usual piercer 15 which moves between the shoes 12 of the presser foot. The structure thus far described is all very old in the art but it is to these part-s of the machine to which my invention is adapted to be attached. My improved cutting device includes a bloch 16 fixed to the presser foot rearward of the same and which bloclr is provided with a bifurcation 17. rlhe furcations 18 formed by the bifurcation 17 are y provided with aligned threaded openings 19,

which receive externally threaded sleeves 2O and 21. The bores of the sleeves receive a shaft 22 and which shaft supports a pair of cutting blades 23 and 2st. The sleeve 21 abuts the blade "24,-, while a collar 25 keyed to the shaft 22 abuts the blade 23 and a spring 26 encircles the shaft 22 and is inter'- posed between the collar 25 and the end of the sleeve 20. lt will therefore be seen that the blades may be moved laterally within the bifurcation by the manipulation of the sleeve 21, and the tension between the blades may be regulated by the operation of the sleeve 20. The tension means lprovided by the spring will automatically take-up. any wear between the cutting blades and should the blades become out of alignment with the plunger piercer 15, the same may be readily adjusted by the operation of the sleeve 21. For the purpose of locking the sleeves 2O and 21 in adjusted position, I provide suitable locl: nuts 27 threaded to the sleeves and which are adapted to abut the sides of the block 16.

lThe blade 23 above referred to is adapted to be positioned when in operative position upon the platform over which the goods to be cut is moved, and which shall be termed the stationary blade as the saine does not operate after being moved to an operative position. The blade 2e' is so positioned that the same does not touch the platform during the operation of the same and this blade will be termed the movable blade as the same is operated during the reciprocation of the piercer bar when the blades are in operative position. l

rEhe stationary blade 23 has. its free end connected with a spring 28 and which spring is,connected to a collar 29 carried by the presser foot bar 10. rlhe action of the spring is to hold the cutting;` end of the blade in an operative position for co-aetion with the mo fable blade.

The means for operating the movable blade comprises a link 30 pivoted to the. piercer bar bracket ist and which link is connected vvith a connecting,y rod 3l. fr crank 32 is journalled in the block 16, and to one end of which the connecting rod 3l is secured. A link 33 connects the other end of the crank ivith the tail of the movable blade 2l. F rom this construction, it Will be noted that the connecting` rod 3l and crank 32 serve as a rocker arm for imparting movement from the piercer bar 13 during its reciprocating' movement to the movable blade, which blade co-acts With the stationary blade to sever a fabric betvveen the holes left therein by the piercer bar and .vhich provides a picot edge on the fabric after being severed, as the edges are bound by stitching;l provided by the usual needles of the hemstitching machine. The crank il?? is radially adjustable ivith respect to the link 3l by means of a set screw 39 so as to take up the vvear of the movable blade.

When the machine is adapted for use for hemstitching purposes only, the stationary blade which is normally disposed adjacent the plat-form, may be moved to an inoperative position by a suitable means now to be described. split bearing` 34 is formed in the rear face of the block 1G and supports a shaft 35, which has keyed thereto a finger 3G Which is disposed in the path of the tail of the stationary blade l set sci-euv 3T passes through the bearing and coacts ivith the shaft for holding the same in an adjusted position against the action of the spring 2S when the finger is moved to a position for holding the cutting end of the blade above the platf rm. A manipulating,` handle 3S is also keyet to thc shaft for permitting;` the shaft to be rotated for movingthe finger to an operative and inoperative position. ll'hen the linger is engaged ivith the tail of the stationary blade, the same ivill hold the blade in an elevated position against. the tension of the spring' Q8 which ivill permit the fabric worked upon topass beneath the cutter blades Without contacting` therewith. I

llihile l have described vvhat l deem to be the most desirable embodiment of my invention, it is obvious that many ot the details may be varied without in any Way derartingfrom the spirit of my invention, and l therefore do not limit myself to the exact details ot construction herein set forth nor to anything' less than the vvhole of my invention limited only by the appended claims.

lVhat is claimed as nevv is 1. ln an automatic picot cutting device,

the eomlfiination with the presser 'tout and piercer bar ol a hemstitchinj; machine, a pair of cutting blades, means between said piercer bar and one of said blades for im* parting` movement from the former to the latter, and adjusting means for laterally moving' said cutting' blades, said last means including; a pair of aligned sleeves adjust ably supported by said presser foot. one oi" said sleeves engaging one of said blades, a shaft supported by said sleeves and on ivhich said blades are pivotally mounted, and a spring, interposed between the other of said sleeves and the other of said blades.

2. In an automatic picot cutting device, the combination with the presser' foot and piercer bar of a hemstitching machine, said presser foot having a bifurcation therein, a pair of sleeves adjustably mounted in the furcations formed by Said bifurcation at diametrically opposite points, a shaft supported by said sleeves, a pair of cutting,r blades mounted on said shaft, tension means for holding sai-d cutting,` blades in co-aetingr position against one of said sleeves, and means for transmitting motion from said piercer bar to one of said cutter blades.

3. In an automatic picot cutting device, the combination with the presser foot and piercer bar of a hemstitching machine, said presser foot having a bifurcation therein, a pair of sleeves adjustably mounted in the furcations formed by said bifurcation at di ametrically opposite points, a shaft supported by said sleeves, a pair of cut-tingr blades mounted on said shaft, tension means for holding` said cutting blades in co-acting position against one of said sleeves, means for transmitting motion from said piercer bar to one of said cutter blades, and means engageable ivith the other of said' cutter blades for holding the same in an inoperative position.

In an automatic picot cutting,r device, the combination with the presser 'toot and piercer bar of a hemstitching machine, said presser foot havingf a bifurcation therein, a, pair of sleeves adjustably mounted in the fui-cations formed by said bifurcation at diametrically opposite points, a shaft supported by said sleeves, a pair ol cutting' blades mounted on said sha tt, tension means for holding` said cutting:lr blades in (fo-acting position against one ol .said sleeves, :nifl means for transmitting motion Vfrom said piercer harto one of said cutter blades.

5. In an automatic picot cutting device, the combination With the presser foot and piercer bar of a hemstitching machine, said presser foot having a bifurcation therein, a pair of Sleeves adjustably mounted in the furcations formed by said bifurcation at diametrieally opposite points, a shaft supported by said sleeves, a pair of cutting,r blades mounted on said shaft, tension means for holding said Cutting blades in eo-acting position against one of said sleeves, and means for transmitting motion from said piercer loar to one of said cutter blades, said last means including a crank shaft operatively connected with said piercer loar and one oi'said Cutting blades by suitable links,

and means for radially adjusting the crank shaft With relation to the link connecting the sam-e with said piercer bar.

` In testimony whereof I have aiiixed my signature.

MYER SIEGEL. 

